<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="jquery-2.0.0.min.js"></script>
</head>
<body>
    <script>
    $(function(){
        $("#btn").click(function(){
            if($("#box").prop("checked")){
                $("#box").prop("checked",false)
            }else{
                $("#box").prop("checked",true);
            }
        })
    })
    </script>
    <input type="button" value="选中/不选中" id="btn">
    <input type="checkbox" id="box">
</body>
</html>